My limited understanding is that the only interactions we have with other galaxies is through photons, and that photons have no anti-particle (or are their own anti-particle). I’m also under the impression that the vast majority of galaxies are very far apart from each other and moving further away, so we wouldn’t be able to observe matter galaxies interacting with antimatter galaxies. How do we know that some of the galaxies we can see aren’t made of anti-matter? Would it be important if some of them were?
In: Physics
There is more gas in between galaxies than there is matter in them. If there were a galaxy made of anti matter there would be a boundary where the anti matter gas that makes up that galaxy interacts with matter. This would create an extremely bright and obvious signal. We dont see this.
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